Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Can you solve below mathematical equation?

2^1234 - 2^1233

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Can you identify the hidden rebus in the image below?